EP2622276B1 - Oil premix burner - Google Patents
Oil premix burner Download PDFInfo
- Publication number
- EP2622276B1 EP2622276B1 EP11758482.1A EP11758482A EP2622276B1 EP 2622276 B1 EP2622276 B1 EP 2622276B1 EP 11758482 A EP11758482 A EP 11758482A EP 2622276 B1 EP2622276 B1 EP 2622276B1
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- European Patent Office
- Prior art keywords
- tube
- inner tube
- oil
- premix burner
- burner according
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
- F23D11/402—Mixing chambers downstream of the nozzle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- the invention relates to an oil premix burner according to the preamble of claim 1.
- Such oil premix burners have a cylindrical fuel assembly with a burner surface on the outer surface.
- a distribution chamber for the resulting oil mist so that it evenly reaches the burner surface from the inside.
- Combustion air enters the distribution chamber via at least one inflow opening in the region of the oil injection device, which can be an injection valve or an oil nozzle which is fastened to a nozzle with an oil preheater.
- Upstream of the oil injection device is a combustion air duct with connection to a blower.
- the so-called premix burners have prevailed.
- the fuel and the combustion air required for combustion thereof are locally mixed by the flame and then burned.
- a cylindrical fuel assembly is used as a flame holder, which is permeable to the fuel / air mixture and enclosing an interior to which the fuel / air mixture is supplied.
- the basic principle of an oil premix burner is the mixing of finely atomised oil with preheated air.
- the surface combustion is possible even without a cold flame.
- the heating of air due to the low heat capacity is relatively difficult because either an effective heat transfer via a wall to the air flow and / or high wall temperatures are necessary.
- An oil premix burner is for example from the DE 10 2006 000 174 A1 known.
- the fact is used that hot air evaporates the oil and thus a gas mixture can be formed, which passes through as a gas premix burner through the flame holder and burns.
- the addition of exhaust gas to the combustion air for air preheating the formation of nitrogen oxides is also reduced and thereby should also improve the startup behavior, because the operating point is reached relatively quickly.
- the combustion air is passed for heat absorption by at least partially projecting beyond a burner surface, spaced from the burner flame guide and accelerated in a nozzle in the guide so that the exhaust gas can be sucked from the combustion chamber and mixed with the air.
- the DE 26 43 293 A1 describes such a channel for the combustion air, which is arranged as a cylinder around the rear portion of a fuel assembly. Since a certain minimum fuel element diameter is required for the mixing and the combustion reaction, however, this structure can lead to a relatively large overall combustion chamber compared to known designs.
- the invention is therefore based on the object of optimizing the quality of combustion and the robustness, especially with regard to modulation capability, in the case of an oil premix burner.
- the oil premix burner is characterized in that the inner tube and the outer tube are flowed through in series.
- the air heat exchanger is arranged above the burner surface and consists of several symmetrical over the circumference distributed, axially parallel to the fuel assembly at least over a portion of its length extending and parallel flowed through double tube elements.
- Each double tube element has at the end face of the free end a deflection zone as a connection between the inner tube and an annular space formed between inner tube and outer tube.
- each double pipe element is advantageously connected at its inlet side of the inner tube to the combustion air duct.
- the combustion air enters and passes in each case after leaving the inner tube in a deflection zone on the end face of the free end in the annular space formed between the inner tube and outer tube.
- the already preheated air flows back towards ⁇ lleinspritzvoriquessnaher front side and absorbs more heat. It enters there as preheated combustion air in the area around the oil injection device in the distribution chamber.
- the inner tube in a double tube element at the oil injector near end, extends beyond the outer tube in the longitudinal direction, so that it passes through the outlet region of the annular gap which is in communication with the distribution chamber and extends through a boundary wall into the combustion air channel.
- the inner tube and / or outer tube have turbulence-generating surfaces, a profiling and / or surface-enlarging elements in order to improve the heat transfer and, in particular, break up the wall-near flow.
- the inner tube and / or the outer tube are provided with profilings and / or beads for turbulence generation, which preferably run helically on the tube surface. It is particularly advantageous if at least the inner tube is provided on its outer side with means for influencing the flow in the surrounding annular gap.
- the diameters of inner tube and outer tube are dimensioned so that the free cross section remains at least equal to or increases in the course of the flow path of the combustion air. This achieves an adaptation to the volume increasing with the air temperature.
- the flow velocity, and thus the heat absorption capacity and also the heat load of the outer surface can be selectively influenced in the respective channel regions.
- the inner tube may also be provided with a plurality of apertures in its jacket. These allow a direct flow into the surrounding annular gap, provide in the annular gap for local turbulence and cooling effects, and are preferably at least ten times smaller in cross section than the inner diameter of the inner tube.
- the invention can provide that inner tube and outer tube are at least selectively supported against each other. This is done in particular in the deflection zone on the front side of the free end and / or by mounting parts and / or a special design of the pipe wall by this example, with web-like projections, exhibitions, small bends in the end or local embossing is provided.
- the arrangement according to the invention with the integrated air heat exchanger is advantageous. This applies to burners with a cylindrical fuel element as well as for surface burners with a horizontal burner surface and the inventive construction.
- the flame burns on or in the burner surface, so that above it energy is decoupled from the flame and used to heat the combustion air. This eliminates an electric air preheating during the stationary burner operating state. This has a positive effect on the energy balance of the burner.
- a significant advantage of the present invention integrated air preheating function is that with increasing burner surface, for example, in a fuel assembly for larger power ranges, and the heat exchanger surface is equally expandable by simply longer double pipe elements are used. Thus, the desired air temperature remains constant.
- Each pipe is defined by its specific power density and the number of pipes as a function of the total power.
- combustion air is to be provided in all burner operating points with a minimum temperature of about 350 ° C.
- the maximum permissible surface temperature at Air heat exchanger the length of pipe elements of conventional design, ie in the form of smooth, U-shaped heat exchanger sheets, and the number of tubes can not be increased arbitrarily. In addition to the limits in the maintenance of the maximum bending radius otherwise increase with longer conventional pipes and the material temperatures on and bring a risk of sagging with it.
- each double tube element of the air heat exchanger is clamped only on one side.
- a fuel assembly adapted lengths or projections of double tube elements can be realized by mutual support of inner and outer tubes.
- the double pipe elements according to the invention can achieve a higher packing density on a partial circle in the region of the burner surface than in the prior art. They also have advantages in terms of pressure loss and scalability.
- a countercurrent heat exchanger is realized with a double pipe element, because the air flow in the two channels is opposite.
- the oil premix burner essentially consists of a cylindrical fuel element 1, with a burner surface 2 on the outer lateral surface, a distribution chamber 3 below the burner surface 2, a central oil injection device 4 and a combustion air duct 5 connected to an upstream fan.
- the fuel assembly 1 has to preheat the combustion air in the region above the burner surface 2 an air heat exchanger, which consists of several symmetrical over the circumference distributed, parallel flowed through double-tube elements 6 with a flow-through in series inner tube 7 and concentric with this outer tube 8 is.
- Each double pipe element 6 is closed at the end face of the free end with a cap 9, so that a flow-favorable deflection zone 10 has a connection between the inner tube 7 and an annular space 11 formed between this and the outer tube 8. From the combustion air channel 5 combustion air passes into the inner tube 7 of each double tube element 6 and via the deflection zone 10 in the annular space 11. In it, it flows back in the direction of oil injection device 4 and enters the distribution chamber 3 a.
- Both the inner and the outer tube 7, 8 have turbulence-generating surfaces and are provided with a profiling 12, as shown as spirally running on the tube surfaces beads.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
Die Erfindung betrifft einen Ölvormischbrenner nach dem Oberbegriff des Patentanspruches 1.The invention relates to an oil premix burner according to the preamble of
Derartige Ölvormischbrenner besitzen ein zylindrisches Brennelement mit einer Brenneroberfläche auf der äußeren Mantelfläche. Um eine zentrale Öleinspritzvorrichtung befindet sich in der Regel eine Verteilkammer für den entstehenden Ölnebel, damit dieser gleichmäßig von innen her die Brenneroberfläche erreicht. In die Verteilkammer gelangt Verbrennungsluft über mindestens eine Einströmöffnung im Bereich der Öleinspritzvorrichtung, wobei es sich um ein Einspritzventil oder eine Öldüse, welche an einem Düsenstock mit Ölvorwärmer befestigt ist, handeln kann. Stromaufwärts der Öleinspritzvorrichtung befindet sich ein Verbrennungsluftkanal mit Verbindung zu einem Gebläse.Such oil premix burners have a cylindrical fuel assembly with a burner surface on the outer surface. To a central oil injection device is usually a distribution chamber for the resulting oil mist so that it evenly reaches the burner surface from the inside. Combustion air enters the distribution chamber via at least one inflow opening in the region of the oil injection device, which can be an injection valve or an oil nozzle which is fastened to a nozzle with an oil preheater. Upstream of the oil injection device is a combustion air duct with connection to a blower.
Insbesondere bei Gasbrennern, die modulierend betrieben werden, also bei denen der Leistungsbereich zwischen einem geringen Anteil der Maximalleistung und der Maximalleistung gesteuert werden kann, haben sich die sogenannten Vormischbrenner durchgesetzt. Bei diesen Brennern wird der Brennstoff und die zu dessen Verbrennung erforderliche Verbrennungsluft von der Flamme örtlich getrennt vermischt und dann verbrannt. Dazu wird meist ein zylindrisches Brennelement als Flammenhalter eingesetzt, der für das Brennstoff-/Luft-Gemisch durchlässig ist und einen Innenraum umschließt, dem das Brennstoff-/Luft-Gemisch zugeführt wird. Mit dieser Technologie lassen sich kleine Flammen mit guten Abgaswerten, relativ kleine Flammenhalter und große Modulationsbereiche verwirklichen.In particular, in the case of gas burners which are operated in a modulating manner, that is, in which the power range between a small proportion of the maximum power and the maximum power can be controlled, the so-called premix burners have prevailed. In these burners, the fuel and the combustion air required for combustion thereof are locally mixed by the flame and then burned. For this purpose, usually a cylindrical fuel assembly is used as a flame holder, which is permeable to the fuel / air mixture and enclosing an interior to which the fuel / air mixture is supplied. With this technology, small flames with good exhaust emissions, relatively small flame holders and large modulation ranges can be realized.
Das Grundprinzip eines Ölvormischbrenners ist die Vermischung von fein zerstäubtem Öl mit vorgewärmter Luft. Durch dieses Prinzip ist es möglich, dass sich zum Beispiel eine sogenannte kalte Flamme bildet, so dass der Brennstoff über eine Oberfläche verbrannt werden kann. Die Oberflächenverbrennung ist allerdings auch ohne kalte Flamme möglich. Generell ist das Erwärmen von Luft auf Grund der geringen Wärmekapazität relativ schwierig, weil dazu entweder ein effektiver Wärmeübergang über eine Wand auf den Luftstrom und/oder hohe Wandtemperaturen notwendig sind.The basic principle of an oil premix burner is the mixing of finely atomised oil with preheated air. By this principle, it is possible that forms, for example, a so-called cold flame, so that the fuel can be burned over a surface. However, the surface combustion is possible even without a cold flame. In general, the heating of air due to the low heat capacity is relatively difficult because either an effective heat transfer via a wall to the air flow and / or high wall temperatures are necessary.
Ein Ölvormischbrenner ist zum Beispiel aus der
Auch die
Weiterhin sind aus der
Der Erfindung liegt daher die Aufgabe zugrunde, bei einem Ölvormischbrenner die Verbrennungsqualität und die Robustheit, besonders im Hinblick auf Modulationsfähigkeit, zu optimieren.The invention is therefore based on the object of optimizing the quality of combustion and the robustness, especially with regard to modulation capability, in the case of an oil premix burner.
Erfindungsgemäß wurde dies mit den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen sind den Unteransprüchen zu entnehmen.This has been achieved with the features of
Der Ölvormischbrenner ist dadurch gekennzeichnet, dass das Innenrohr und das Außenrohr in Reihe durchströmt werden. Dabei ist der Luftwärmetauscher oberhalb der Brenneroberfläche angeordnet und besteht aus mehreren symmetrisch über den Umfang verteilten, sich achsparallel zum Brennelement mindestens über einen Teil dessen Länge erstreckenden und parallel durchströmten Doppelrohrelementen.The oil premix burner is characterized in that the inner tube and the outer tube are flowed through in series. In this case, the air heat exchanger is arranged above the burner surface and consists of several symmetrical over the circumference distributed, axially parallel to the fuel assembly at least over a portion of its length extending and parallel flowed through double tube elements.
Jedes Doppelrohrelement weist an der Stirnseite des freien Endes eine Umlenkzone als Verbindung zwischen Innenrohr und einem zwischen Innenrohr und Außenrohr gebildeten Ringraum auf.Each double tube element has at the end face of the free end a deflection zone as a connection between the inner tube and an annular space formed between inner tube and outer tube.
So ist vorteilhafterweise jedes Doppelrohrelement an seiner Eintrittsseite des Innenrohres mit dem Verbrennungsluftkanal verbunden. Dort tritt die Verbrennungsluft ein und gelangt jeweils nach Verlassen des Innenrohres in einer Umlenkzone an der Stirnseite des freien Endes in den zwischen Innenrohr und Außenrohr gebildeten Ringraum. In diesem strömt die bereits vorgewärmte Luft in Richtung öleinspritzvorrichtungsnaher Stirnseite zurück und nimmt weitere Wärme auf. Sie tritt dort als vorgewärmte Verbrennungsluft im Bereich um die Öleinspritzvorrichtung in die Verteilkammer ein.Thus, each double pipe element is advantageously connected at its inlet side of the inner tube to the combustion air duct. There, the combustion air enters and passes in each case after leaving the inner tube in a deflection zone on the end face of the free end in the annular space formed between the inner tube and outer tube. In this, the already preheated air flows back towards Ölleinspritzvorrichtungsnaher front side and absorbs more heat. It enters there as preheated combustion air in the area around the oil injection device in the distribution chamber.
In einer bevorzugten Ausführungsform überragt in einem Doppelrohrelement am öleinspritzvorrichtungsnahen Ende das Innenrohr das Außenrohr in Längsrichtung, so dass es den mit der Verteilkammer in Verbindung stehenden Ausmündungsbereich des Ringspalts durchgreift und durch eine Begrenzungswand bis in den Verbrennungsluftkanal hinein reicht.In a preferred embodiment, in a double tube element at the oil injector near end, the inner tube extends beyond the outer tube in the longitudinal direction, so that it passes through the outlet region of the annular gap which is in communication with the distribution chamber and extends through a boundary wall into the combustion air channel.
In einer weiteren bevorzugten Ausführungsform weisen Innenrohr und/oder Außenrohr Turbulenz erzeugende Oberflächen, eine Profilierung und/oder Oberflächen vergrößernde Elemente auf, um den Wärmeübergang zu verbessern und insbesondere die wandnahe Strömung aufzubrechen. Dazu sind das Innenrohr und/oder das Außenrohr mit Profilierungen und/oder Sicken zur Turbulenzerzeugung versehen, welche vorzugsweise spiralförmig auf der Rohroberfläche verlaufen. Besonders vorteilhaft ist es dabei, wenn mindestens das Innenrohr auf seiner Außenseite mit Mitteln zur Beeinflussung der Strömung im umgebenden Ringspalt versehen ist.In a further preferred embodiment, the inner tube and / or outer tube have turbulence-generating surfaces, a profiling and / or surface-enlarging elements in order to improve the heat transfer and, in particular, break up the wall-near flow. For this purpose, the inner tube and / or the outer tube are provided with profilings and / or beads for turbulence generation, which preferably run helically on the tube surface. It is particularly advantageous if at least the inner tube is provided on its outer side with means for influencing the flow in the surrounding annular gap.
Vorzugsweise sind die Durchmesser von Innenrohr und Außenrohr so bemessen, dass der freie Querschnitt im Verlauf des Strömungsweges der Verbrennungsluft mindestens gleich bleibt oder zunimmt. Damit wird eine Anpassung an das mit der Lufttemperatur steigende Volumen erreicht. Andererseits ist über die Querschnittsgestaltung auch die Strömungsgeschwindigkeit, und somit die Wärmeaufnahmefähigkeit bzw. auch die Wärmebelastung der Außenoberfläche, in den jeweiligen Kanalbereichen gezielt beeinflussbar.Preferably, the diameters of inner tube and outer tube are dimensioned so that the free cross section remains at least equal to or increases in the course of the flow path of the combustion air. This achieves an adaptation to the volume increasing with the air temperature. On the other hand, via the cross-sectional configuration, the flow velocity, and thus the heat absorption capacity and also the heat load of the outer surface, can be selectively influenced in the respective channel regions.
In noch einer weiteren Ausführungsform kann das Innenrohr auch mit mehreren Durchbrechungen in seinem Mantel versehen sein. Diese lassen eine Direktströmung in den umgebenden Ringspalt zu, sorgen im Ringspalt für lokale Turbulenzen und Kühleffekte, und sind im Querschnitt vorzugsweise jeweils mindestens um das Zehnfache kleiner als der Innendurchmesser des Innenrohres.In yet another embodiment, the inner tube may also be provided with a plurality of apertures in its jacket. These allow a direct flow into the surrounding annular gap, provide in the annular gap for local turbulence and cooling effects, and are preferably at least ten times smaller in cross section than the inner diameter of the inner tube.
Weiterhin kann die Erfindung vorsehen, dass Innenrohr und Außenrohr mindestens punktuell aneinander abgestützt sind. Dabei erfolgt dies insbesondere in der Umlenkzone an der Stirnseite des freien Endes und/oder durch Einbauteile und/oder eine spezielle Ausbildung der Rohrwand, indem diese beispielsweise mit stegartigen Vorsprüngen, Ausstellungen, kleinen Abkantungen im Endbereich oder lokalen Prägungen versehen ist.Furthermore, the invention can provide that inner tube and outer tube are at least selectively supported against each other. This is done in particular in the deflection zone on the front side of the free end and / or by mounting parts and / or a special design of the pipe wall by this example, with web-like projections, exhibitions, small bends in the end or local embossing is provided.
Mit den erfindungsgemäßen Maßnahmen werden bei Ölvormischbrennern sowohl die Verbrennungsqualität als auch die Robustheit verbessert. Insbesondere für modulierenden Betrieb ist die erfindungsgemäße Anordnung mit dem integrierten Luftwärmetauscher vorteilhaft. Dies trifft für Brenner mit einem zylindrischen Brennelement genauso zu wie für Flächenbrenner mit einer horizontalen Brenneroberfläche und dem erfindungsgemäßem Aufbau. Die Flamme brennt an bzw. in der Brenneroberfläche, so dass dabei oberhalb davon Energie aus der Flamme ausgekoppelt und zur Erwärmung der Verbrennungsluft genutzt wird. Damit entfällt eine elektrische Luftvorwärmung während des stationären Brenner-Betriebszustandes. Dies wirkt sich positiv auf die Energiebilanz des Brenners aus.With the measures according to the invention, both the combustion quality and the robustness are improved in oil premix burners. In particular, for modulating operation, the arrangement according to the invention with the integrated air heat exchanger is advantageous. This applies to burners with a cylindrical fuel element as well as for surface burners with a horizontal burner surface and the inventive construction. The flame burns on or in the burner surface, so that above it energy is decoupled from the flame and used to heat the combustion air. This eliminates an electric air preheating during the stationary burner operating state. This has a positive effect on the energy balance of the burner.
Ein bedeutender Vorteil der erfindungsgemäß integrierten Luftvorwärmungsfunktion ist, dass mit zunehmender Brenneroberfläche, beispielsweise bei einem Brennelement für größere Leistungsbereiche, auch die Wärmetauscheroberfläche in gleichem Maße erweiterbar ist, indem einfach längere Doppelrohrelemente zum Einsatz kommen. Damit bleibt die angestrebte Lufttemperatur konstant. Jedes Rohr wird durch seine spezifische Leistungsdichte und die Rohr-Anzahl in Abhängigkeit von der Gesamtleistung definiert. Außer als an den Doppelrohrelementen des Luftwärmetauschers sind dadurch an der Peripherie bzw. sonstigen Brennerkomponenten keine konstruktiven Änderungen für die Darstellung unterschiedlicher Brenner-Leistungsgrößen nötig. Der sonstige Brenneraufbau bleibt somit genauso erhalten wie Anforderungen an den umgebenden Feuerraum.A significant advantage of the present invention integrated air preheating function is that with increasing burner surface, for example, in a fuel assembly for larger power ranges, and the heat exchanger surface is equally expandable by simply longer double pipe elements are used. Thus, the desired air temperature remains constant. Each pipe is defined by its specific power density and the number of pipes as a function of the total power. Aside from the double tube elements of the air heat exchanger, no structural changes are required on the periphery or other burner components for the representation of different burner output variables. The other burner structure is therefore retained as well as requirements for the surrounding furnace.
Mit dem erfindungsgemäßen Luftwärmetauscher soll Verbrennungsluft in allen Brenner-Betriebspunkten mit einer Mindesttemperatur von ca. 350 °C bereitgestellt werden. Dabei ist zu beachten, dass unter Einhaltung die maximal zulässigen Oberflächentemperatur am Luftwärmetauscher die Länge von Rohrelementen herkömmlicher Bauart, d. h. in Form von glatten, U-förmigen Wärmetauscher-Bögen, sowie die Anzahl der Rohre nicht beliebig gesteigert werden kann. Neben den Grenzen in der Einhaltung des maximalen Biegeradius steigen mit längeren herkömmlichen Rohren ansonsten auch die Materialtemperaturen weiter an und bringen eine Gefahr des Durchbiegens mit sich.With the air heat exchanger according to the invention combustion air is to be provided in all burner operating points with a minimum temperature of about 350 ° C. It should be noted that the maximum permissible surface temperature at Air heat exchanger, the length of pipe elements of conventional design, ie in the form of smooth, U-shaped heat exchanger sheets, and the number of tubes can not be increased arbitrarily. In addition to the limits in the maintenance of the maximum bending radius otherwise increase with longer conventional pipes and the material temperatures on and bring a risk of sagging with it.
Im Gegensatz dazu ist erfindungsgemäß aber eine Längenausdehnung aufgrund thermischer Belastung möglich, da jedes Doppelrohrelement des Luftwärmetauschers nur einseitig eingespannt ist. Größere, einem Brennelement entsprechend angepasste Längen bzw. Auskragungen von Doppelrohrelementen lassen sich durch gegenseitige Abstützung von Innen- und Außenrohr realisieren.In contrast, according to the invention but a linear expansion due to thermal stress is possible because each double tube element of the air heat exchanger is clamped only on one side. Larger, a fuel assembly adapted lengths or projections of double tube elements can be realized by mutual support of inner and outer tubes.
Mit der Erfindung wird der Einsatz profilierter Rohre, welche den Wärmeübergang begünstigen und für eine geringe, Material schonende Oberflächentemperatur sorgen, erst möglich. Besonders das Innenrohr kann als Turbulenzanreger bzw. Strömungsbrecher fungieren. Generell lässt sich mit den erfindungsgemäßen Doppelrohrelementen eine gegenüber dem Stand der Technik höhere Packungsdichte auf einem Teilkreis im Bereich der Brenneroberfläche erzielen. Außerdem besitzen diese Vorteile in Bezug auf Druckverlust und Skalierbarkeit. Vom Prinzip her wird erfindungsgemäß mit einem Doppelrohrelement ein Gegenstromwärmetauscher realisiert, denn die Luftströmung in den beiden Kanälen läuft entgegensetzt.With the invention of the use of profiled tubes, which favor the heat transfer and provide a low, material-friendly surface temperature, only possible. Especially the inner tube can act as a turbulence exciter or flow breaker. In general, the double pipe elements according to the invention can achieve a higher packing density on a partial circle in the region of the burner surface than in the prior art. They also have advantages in terms of pressure loss and scalability. In principle, according to the invention a countercurrent heat exchanger is realized with a double pipe element, because the air flow in the two channels is opposite.
Die Zeichnung stellt ein Ausführungsbeispiel der Erfindung dar. Es zeigt:
-
Fig. 1 : einen Ölvormischbrenner im Längsschnitt und -
Fig. 2 : einen Längsschnitt durch eine Teil eines Luftwärmetauschers.
-
Fig. 1 an oil premix burner in longitudinal section and -
Fig. 2 : a longitudinal section through a part of an air heat exchanger.
Der Ölvormischbrenner besteht im Wesentlichen aus einem zylindrischen Brennelement 1, mit einer Brenneroberfläche 2 auf der äußeren Mantelfläche, einer Verteilkammer 3 unterhalb der Brenneroberfläche 2, einer zentralen Öleinspritzvorrichtung 4 und einem an ein stromaufwärts angeordnetes Gebläse angeschlossenen Verbrennungsluftkanal 5.The oil premix burner essentially consists of a
Das Brennelement 1 besitzt zur Vorwärmung der Verbrennungsluft im Bereich oberhalb der Brenneroberfläche 2 einen Luftwärmetauscher, welcher aus mehreren, symmetrisch über den Umfang verteilten, parallel durchströmten Doppelrohrelementen 6 mit einem in Reihe durchströmten Innenrohr 7 und einem zu diesem konzentrischen Außenrohr 8 besteht.The
Jedes Doppelrohrelement 6 ist an der Stirnseite des freien Endes mit einer Kappe 9 verschlossen, so dass eine strömungsgünstige Umlenkzone 10 als Verbindung zwischen Innenrohr 7 und einem zwischen diesem und dem Außenrohr 8 gebildeten Ringraum 11 aufweist. Aus dem Verbrennungsluftkanal 5 gelangt Verbrennungsluft in das Innenrohr 7 jedes Doppelrohrelementes 6 und über die Umlenkzone 10 in den Ringraum 11. Darin strömt sie in Richtung Öleinspritzvorrichtung 4 zurück und tritt in die Verteilkammer 3 ein.Each
Sowohl das Innen- als auch das Außenrohr 7, 8 besitzen Turbulenz erzeugende Oberflächen und sind mit einer Profilierung 12, als spiralförmig auf den Rohroberflächen verlaufende Sicken dargestellt, versehen.Both the inner and the
Claims (11)
- Oil premix burner having a burner element (1), a burner surface (2) on the outer lateral surface, a distribution chamber (3) beneath the burner surface (2), a central oil injection device (4), a combustion air duct (5) connected to a fan arranged upstream, and an air heat exchanger for pre-heating the combustion air in the region of the burner surface (2), wherein the air heat exchanger consists of at least one double-tube element (6) with an inner tube (7) and, concentric with the latter, an outer tube (8),
characterized in that the inner tube (7) and the outer tube (8) are flowed through in series. - Oil premix burner according to Claim 1,
characterized in that the air heat exchanger is arranged above the burner surface (2) and consists of multiple double-tube elements (6) which are distributed symmetrically about the circumference, extend parallel with the axis of the burner element (1) and at least over part of the length of the latter, and are flowed through in parallel. - Oil premix burner according to Claim 1 or 2,
characterized in that each double-tube element (6) has, on the end face of the free end, a redirection zone (10) as connection between the inner tube (7) and an annular space (11) formed between the inner tube (7) and the outer tube (8). - Oil premix burner according to one of Claims 1 to 3,
characterized in that the inlet side of the inner tube (7) of each double-tube element (6) is connected to the combustion air duct (5), in that in each case the combustion air, after it has left the inner tube (7), enters, in a redirection zone (10) at the end face of the free end, the annular space (11) formed between the inner tube (7) and the outer tube (8), flows back in the direction of the end face close to the oil injection device, where it enters the distribution chamber (3), in the region around the oil injection device (4), as pre-heated combustion air. - Oil premix burner according to one of Claims 1 to 4,
characterized in that, in a double-tube element (6), at the end close to the oil injection device, the inner tube (7) projects longitudinally beyond the outer tube (8), such that it passes through the discharge region, connected to the distribution chamber (3), of the annular gap (11) and reaches through a boundary wall into the combustion air duct (5). - Oil premix burner according to one of Claims 1 to 5,
characterized in that the inner tube (7) and/or the outer tube (8) have turbulence-generating surfaces, a profile (12) and/or surface-increasing elements. - Oil premix burner according to one of Claims 1 to 6,
characterized in that the inner tube (7) and/or the outer tube (8) are provided with profiles (12) and/or beading for generating turbulence, which preferably run spirally on the tube surface. - Oil premix burner according to one of Claims 1 to 7,
characterized in that at least the inner tube (7) is provided, on its outer side, with means for influencing the flow in the surrounding annular gap (11). - Oil premix burner according to one of Claims 1 to 8,
characterized in that the diameters of the inner tube (7) and of the outer tube (8) are dimensioned such that the free cross section increases or at least remains constant along the flow path of the combustion air. - Oil premix burner according to one of Claims 1 to 9,
characterized in that the inner tube (7) is provided with multiple cutouts in its jacket, which permit a direct flow into the surrounding annular gap (11), produce localized turbulence and cooling effects in the annular gap (11) and whose cross section is always at least ten times smaller than the internal diameter of the inner tube (7). - Oil premix burner according to one of Claims 1 to 10,
characterized in that the inner tube (7) and the outer tube (8) are supported by one another at least punctually, wherein this is effected in particular in the redirection zone (10) on the end face of the free end and/or by means of inserts and/or a special design of the tube wall.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010046733A DE102010046733B4 (en) | 2010-09-28 | 2010-09-28 | Ölvormischbrenner |
| PCT/EP2011/066579 WO2012041775A1 (en) | 2010-09-28 | 2011-09-23 | Oil premix burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2622276A1 EP2622276A1 (en) | 2013-08-07 |
| EP2622276B1 true EP2622276B1 (en) | 2015-07-15 |
Family
ID=44658764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11758482.1A Not-in-force EP2622276B1 (en) | 2010-09-28 | 2011-09-23 | Oil premix burner |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20130260326A1 (en) |
| EP (1) | EP2622276B1 (en) |
| CN (1) | CN103119364A (en) |
| DE (1) | DE102010046733B4 (en) |
| WO (1) | WO2012041775A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012012541A1 (en) | 2012-06-26 | 2014-01-02 | Robert Bosch Gmbh | Ölvormischbrenner |
| DE102012012539A1 (en) | 2012-06-26 | 2014-01-02 | Robert Bosch Gmbh | Ölvormischbrenner |
| DE102012017241A1 (en) | 2012-08-31 | 2014-03-27 | Robert Bosch Gmbh | Oil burner and method for controlling the mixing zone temperature thereto |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1082576A (en) | 1912-03-23 | 1913-12-30 | William Albert White | Furnace-front. |
| US2937855A (en) * | 1958-09-11 | 1960-05-24 | Frank D Hazen | Recuperator structures |
| AT287163B (en) * | 1967-08-17 | 1971-01-11 | Aichelin Fa J | INDUSTRIAL BURNER, PREFERABLY FOR GAS FUELS, WITH RECUPERATIVE AIR PRE-HEATING |
| US3695816A (en) * | 1969-11-01 | 1972-10-03 | Gas Council | Self-recuperative burners |
| FR2080088A6 (en) | 1970-02-23 | 1971-11-12 | Chaudronnerie Entr Indle | |
| DE2643293A1 (en) | 1976-09-25 | 1978-03-30 | Herbert Ahlgrimm | Oil burner system with constant blower speed - ensures stable flame and ignition by annular reversed air flow path |
| IT1091238B (en) * | 1977-09-27 | 1985-07-06 | Fiat Spa | HEAT RECOVERY FROM EXHAUSTED GAS AT HIGH TEMPERATURE FOR RADIATION AND CONVENTION |
| DE2808213C2 (en) * | 1978-02-25 | 1979-10-11 | 4300 Essen | Recuperative coke oven and method for operating the same |
| DE2836433C2 (en) * | 1978-08-19 | 1986-07-10 | Ipsen Industries International Gmbh, 4190 Kleve | Recuperative burners for industrial furnaces |
| US4445842A (en) * | 1981-11-05 | 1984-05-01 | Thermal Systems Engineering, Inc. | Recuperative burner with exhaust gas recirculation means |
| DE3202938A1 (en) * | 1981-11-06 | 1983-05-19 | Feraton Anstalt, 9494 Schaan | METHOD AND DEVICE FOR HEATING COMBUSTION AIR AND FUEL IN HEATING SYSTEMS |
| DE3317490C2 (en) * | 1983-05-13 | 1986-11-20 | INOTHERM Industrieofen- und Wärmetechnik GmbH, 4050 Mönchengladbach | Heat exchanger |
| US4480986A (en) * | 1983-09-14 | 1984-11-06 | Sea-Labs, Inc. | Liquid fuel vaporizing burner |
| CN1059963A (en) * | 1990-03-22 | 1992-04-01 | 阿莫尼·卡萨尔公司 | High-performance heat exchanger |
| AT402670B (en) * | 1993-08-09 | 1997-07-25 | Vaillant Gmbh | SHEET HEAT EXCHANGER SHEET HEAT EXCHANGER |
| EP0860673A3 (en) * | 1997-02-21 | 1999-03-24 | Haldor Topsoe A/S | Synthesis gas waste heat boiler |
| DE102006000174B9 (en) | 2006-04-13 | 2009-04-16 | Honeywell Technologies Sarl | Oil premix burner and method of operation therefor |
| DE102008020424B4 (en) * | 2008-04-24 | 2010-05-27 | Robert Bosch Gmbh | Ölvormischbrenner |
| DE202008005913U1 (en) * | 2008-04-29 | 2009-09-03 | Robert Bosch Gmbh | Ölvormischbrenner |
| DE102008039403A1 (en) * | 2008-08-22 | 2010-02-25 | Robert Bosch Gmbh | heater |
| DE202009017858U1 (en) * | 2009-08-05 | 2010-12-16 | Robert Bosch Gmbh | Ölvormischbrenner |
-
2010
- 2010-09-28 DE DE102010046733A patent/DE102010046733B4/en not_active Expired - Fee Related
-
2011
- 2011-09-23 CN CN201180046106XA patent/CN103119364A/en active Pending
- 2011-09-23 US US13/876,731 patent/US20130260326A1/en not_active Abandoned
- 2011-09-23 WO PCT/EP2011/066579 patent/WO2012041775A1/en active Application Filing
- 2011-09-23 EP EP11758482.1A patent/EP2622276B1/en not_active Not-in-force
Also Published As
| Publication number | Publication date |
|---|---|
| EP2622276A1 (en) | 2013-08-07 |
| DE102010046733A1 (en) | 2012-03-29 |
| WO2012041775A1 (en) | 2012-04-05 |
| DE102010046733B4 (en) | 2012-08-02 |
| CN103119364A (en) | 2013-05-22 |
| US20130260326A1 (en) | 2013-10-03 |
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